US3763099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polycarbonate using a guanidine catalyst
Assignee: General Electric Co
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Filing: 1971-11-01
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Granted: 1973-10-02
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Expires: 1991-11-01
Abstract
Abstract AN IMPROVED PROCESS FOR PREPARING AN AROMATIC CARBONATE POLYMER BY CARRYING OUT THE REACTION IN THE PRESENCE OF A PARTICULAR CATALYST. THE PARTICULAR CATALYST EMPLOYED HEREIN CAN BE EITHER A GUANIDINE OR A A SUBSTITUTED GUANIDINE AND IS PRESENT DURING THE REACTION IN AN AMOUNT OF 0.1-10.0 MOLE PERCENT.
Inventors
- 👤 D Jaquiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |